Is a 400 Bad Request error a problem with the website itself, or my browser?

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Grade: Education Subject: Support
Is a 400 Bad Request error a problem with the website itself, or my browser?
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While it's often a client-side issue (your browser), a 400 error *can* sometimes be caused by a problem on the website's server. If you've tried all client-side troubleshooting steps and the error persists, it's likely a server-side issue, and you may need to contact the website's support team.